There is no single standard size
A couch is a seat for more than one person, and the word covers everything from a two-seat loveseat to a long sectional (Couch, Wikipedia). No rule fixes the width of a sofa, so makers pick their own. What you can do is look at what makers actually publish. The table below is built from the 459 models on this site, using each maker's stated numbers. For models sold in a range of widths, it uses the smallest stated width.
| Type | Models | Width range | Median width | Median depth | Median seat depth | Median seat height |
|---|---|---|---|---|---|---|
| Loveseat | 50 | 54.5 to 82 in | 64.5 in | 38.75 in | 23 in | 19.5 in |
| Sofa | 221 | 53 to 131.9 in | 82.7 in | 38 in | 23.6 in | 18.85 in |
| Sleeper sofa | 40 | 68.9 to 126.8 in | 82 in | 39.45 in | 22.8 in | 19 in |
| Modular | 60 | 73.2 to 146 in | 99.9 in | 44.88 in | 26 in | 18 in |
| Sectional | 88 | 67 to 163.4 in | 108.15 in | 67.65 in | 24 in | 18 in |
So a typical sofa on this site is about 83 inches wide and 38 inches deep. A typical loveseat is about 65 inches wide. Sectionals have two long sides, so their depth is the length of the chaise or return, not the depth of a seat.
The five numbers that matter
Makers list more measurements than most buyers need. These five decide whether a sofa fits and feels right:
- Width: the widest point, usually from the outside of one arm to the outside of the other.
- Depth: the full front-to-back footprint on the floor.
- Height: the floor to the top of the back.
- Seat depth: the front edge of the cushion to the back cushion. See our seat depth guide.
- Seat height: the floor to the top of the seat cushion.
Width and depth tell you whether it fits the room. Seat depth and seat height tell you whether it fits you. Makers do not always measure the same way, so treat small differences as noise.
Real examples
| Model | Width | Depth | Height | Seat depth | Seat height | Price |
|---|---|---|---|---|---|---|
| Castlery Pebble Loveseat | 73.2 in | 34.6 in | 32.3 in | 23.6 in | 17.7 in | $599 |
| Castlery Pebble Sofa | 83.1 in | 34.6 in | 32.3 in | 23.6 in | 17.7 in | $779 |
| Castlery Isaac Sofa | 74.8 in | 35.4 in | 32.7 in | 23.6 in | 18.9 in | $979 |
| HERNEST Lysande 87" Sofa | 87.4 in | 37 in | 33.7 in | 23.4 in | 18.5 in | $1,199 |
| Joybird Lewis Sofa | 83 in | 42 in | 32 in | 28 in | 18 in | $1,374 |
| La-Z-Boy Noah Sofa | 83 in | 36 in | 36.5 in | 22 in | 20.5 in | $1,459 |
| Joybird Wilder Sofa | 96 in | 41 in | 36 in | 27 in | 20 in | $1,673 |
| Albany Park Barton Sofa | 101 in | 40 in | 30.5 in | 25 in | 18 in | $2,251 |
| Castlery Fable Performance Fabric Sofa | 107.9 in | 46.1 in | 33.5 in | 27.95 in | 16.73 in | $2,398 |
Prices are as of November 9, 2026. The Castlery Pebble pair shows how a loveseat and a sofa differ: the same depth, height and seat, but the sofa is 9.9 inches wider and costs $180 more. Our loveseat vs sofa guide goes deeper.
What the numbers say about comfort
Seat height varies more than you might expect. Medians sit near 18 to 19.5 inches, but the La-Z-Boy models run higher: the Kennedy Sofa has a 21.5 inch seat height and the Joel Reclining Sofa 21.5, while the Castlery Fable has 16.73.
Seat depth runs from about 20 inches to above 28. The Castlery Isaac Sofa has 23.6, the Joybird Lewis Sofa 28, the HERNEST Alba 91" Sofa 31.5. Body measurements differ from person to person (Anthropometry, Wikipedia), so the seat depth that suits you may not suit someone else.
How to use these sizes
Start with the room, not the sofa. Find the longest clear wall and the floor space in front of it, then pick a width band:
- Under 72 inches: see sofas under 72 inches.
- 72 to 80 inches: see sofas 72 to 80 inches.
- 80 to 90 inches: see sofas 80 to 90 inches.
- Over 90 inches: see sofas over 90 inches.
Many models are sold in several widths. The Joybird Hughes Sofa runs from 66 to 96 inches, and the DreamSofa line is made to order in many widths. If one size fits your room, the model counts.
Then check how to get it into the room. Our guide to measuring for a sofa covers doorways, hallways and stairs. If space is tight, read about apartment sofa sizes or see the price guide.
